Frame building long and narrow
Frame building long and narrow
(OP)
My client wants a frame building 40 ft wide 100 ft long 18ft stud walls, wood pre-engineered trusses at 2 ft oc. He wants two 16 ft wide x 16 ft high doors in the end wall. That leaves just 8 ft that could be employed as a shear wall. I'm not sure that will do it. He does not want interior shear walls (40ft wide). Knee braces would be a last resort. Any ideas are welcome. Foundation is a concrete wall on a footing to frost depth






RE: Frame building long and narrow
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RE: Frame building long and narrow
DaveAtkins
RE: Frame building long and narrow
Steel frames at 25' centers seems more reasonable with pre-engineered parallel chord wood trusses or steel purlins spanning between frames.
BA
RE: Frame building long and narrow
There are thousands of buildings constructed in this manner every year.
RE: Frame building long and narrow
You would essentially be making up a 40' deep horizontal truss in the plane of the bottom chord for a diaphragm taking the loads to the end-wall moment frames.
RE: Frame building long and narrow
RE: Frame building long and narrow
I would forget the frame unless a SW would not work. If you extend the concrete stem wall high enough to limit the wood SW height to 12 feet, then the wood portion of a 4' wide SW would fall within the allowable aspect ratio of 3.5 to 1.
I would use spacings of 4'-0", 16'-4", 1'-4", 16'-4", and 2'0" across the endwall, with the 4'0" dimension being the shearwall portion. You should be able to do it with one layer of plywood each side, but the holddowns will probably be very large - HD 10A or better. May have to use a header beam over the first door to span out, and lower, the holdown force to the foundation.
You will probably also need a concrete grade at the endwall to span out the uplift loads.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Frame building long and narrow
May have to do what Dave Atkins suggested.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Frame building long and narrow
If the lateral forces are high, I would consider using cantilevered steel posts and then fixing the wood frame to the steel posts.
When you sketch it to scale there is not much to work with in the end walls to obtain lateral stability.